Kusuma, Jeffry. “Solusi Persamaan Helmholtz Untuk Material Komposit”. Jurnal Matematika, Statistika dan Komputasi 13, no. 1 (February 5, 2018): 39–45. Accessed December 22, 2024. https://journal.unhas.ac.id/index.php/jmsk/article/view/3477.